Hi Arminius
I have not come across anything specific concerning the two apparent
weight standards for this issue.
At this time, the coinage
type was changed regularly, perhaps as a means to earn
money for the crown via the issuing of new dies to the
moneyers. And in general, the
weight of a particular
type decreased with time over the duration of the
type - thus meaning increased profit for the moneyer ... maybe this issue was just an extreme case of this change in
weight, maybe there was a shortage of silver, or a special levy on
moneyers that required them to more drastically reduce the
weight ... will see if I can find anything relating to this
type and let you know!
Regards
Allan